Lutz-Jesco MEMDOS SMART LB, Руководство по эксплуатации

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Troubleshooting
Type of fault
37
© Lutz-Jesco GmbH 2014
Subject to technical changes
140410
Stepper Motor-driven Diaphragm Dosing Pump MEMDOS SMART LB Operating Instructions
BA-10100-02-V02
13.1.4 Delivery rate varies
13.1.5 No stroke movement observed
13.1.6 Dosing pump delivery rate too high
Viscosity too high

Possibly reduce the concentra-
tion of the dosing medium or
increase the temperature.

Install spring-loaded valves.

Increase the pipe diameter.
Current supply interrupted

Reconnect the current supply
Dry the valves

Dampen the dosing head and
the valves

Vent the dosing head.
Air in the suction line with
simultaneous pressure on the
discharge valve

Vent the dosing head or the
lines.
Possible cause Remedy
Valve leaking or blocked

Clean the valve and vent the
dosing pump.

Tighten the screw connections.
Valve damaged (e.g. valve
balls)

Remove the damaged parts or
install a new valve.
Suction line is leaking

Seal the leak locations or
replace the parts.
Suction line is blocked (e.g.
screen in foot valve)

Clean the suction line
Viscosity too high

Possibly reduce the concentra-
tion of the dosing medium or
increase the temperature.

Install spring-loaded valves.

Increase the pipe diameter.
The dosing pump's electrical
data does not match that of
the mains supply

Check the electrical installation.
Suction side pressure too
high (pump siphoning)

Install a back-pressure valve in
the pressure line.
Pressure peaks due to accel-
eration with long suction
lines

Install a suction pressure regu-
lator.
Table 13-4: Type of fault: Delivery rate varies
Possible cause Remedy
Table 13-3: Type of fault: Dosing pump does not prime
Imprecise dosing due to
changeable positive and
negative suction heads

Install a suction pressure regu-
lator.
System back pressure too
high (measured at discharge
connection of dosing pump)

Clean blocked injection nozzle.

Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.

Check function of safety valves.
Possible cause Remedy
Diaphragm return spring
broken

Contact the manufacturer.
Current supply interrupted

Reconnect the current supply
The dosing pump's electrical
data does not match that of
the mains supply

Check the electrical installation.
Pressure peaks due to accel-
eration with long suction
lines

Install a suction pressure regu-
lator.
System back pressure too
high (measured at discharge
connection of dosing pump)

Clean blocked injection nozzle.

Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.

Check function of safety valves.
Table 13-5: Type of fault: No stroke movement observed
Possible cause Remedy
Suction side pressure too
high (pump siphoning)

Install a back-pressure valve in
the pressure line.
Pressure peaks due to accel-
eration with long suction
lines

Install a suction pressure regu-
lator.
Table 13-6: Type of fault: Dosing pump delivery rate too high
Possible cause Remedy
Table 13-4: Type of fault: Delivery rate varies